A hard case for a MacBook works fine. I haven't had any problems with them yet. The bag, in which you can store your MacBook when traveling, is very tight-fitting. I'm not sure if it's the hard case or not. As for the pieces that go on the keyboard, I don't understand their purpose because it's hard to tell which keys are which for one, but for two it doesn't allow you to type them on the keyboard.
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